中文摘要：

基于属性的密码体制中用户的多个属性由一个授权中心管理,这将会增大其工作负担,降低工作效率.本文设计了一个可证明安全的多授权中心的签名方案,将用户的多个属性由不同的授权中心分别管理,属性参数在全域范围选择.采用归约安全证明的研究方法证明此方案的安全性归约为计算Diffie-Hellman难题,方案具有存在性不可伪造和抗合谋攻击的特性.

英文摘要：

In attribute-based cryptosystem,many attributes of a user were monitored by a single authority,which would inevitably increase its workload and reduce its efficiency.The firstly proposed multi-authority signature scheme was that many attributes were monitored by many different authorities respectively and its attributes were picked from the large universe.By using the methodology of reduction security argument,the security of this scheme was proved equal to the computational Diffie-Hellman problem.Two characteristics of the scheme are the existential unforgeability and the prevention of collusion attacks.